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linux-stable/drivers/iio/light/ltr501.c
Jonathan Cameron 2684d50034 iio:light:ltr501 Fix timestamp alignment issue. 
One of a class of bugs pointed out by Lars in a recent review.
iio_push_to_buffers_with_timestamp assumes the buffer used is aligned
to the size of the timestamp (8 bytes).  This is not guaranteed in
this driver which uses an array of smaller elements on the stack.
Here we use a structure on the stack.  The driver already did an
explicit memset so no data leak was possible.

Forced alignment of ts is not strictly necessary but probably makes
the code slightly less fragile.

Note there has been some rework in this driver of the years, so no
way this will apply cleanly all the way back.

Fixes: 2690be9051 ("iio: Add Lite-On ltr501 ambient light / proximity sensor driver")
Reported-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: <Stable@vger.kernel.org>
2020-08-22 11:38:58 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* ltr501.c - Support for Lite-On LTR501 ambient light and proximity sensor
*
* Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net>
*
* 7-bit I2C slave address 0x23
*
* TODO: IR LED characteristics
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/regmap.h>
#include <linux/acpi.h>
#include <linux/iio/iio.h>
#include <linux/iio/events.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/buffer.h>
#include <linux/iio/triggered_buffer.h>
#define LTR501_DRV_NAME "ltr501"
#define LTR501_ALS_CONTR 0x80 /* ALS operation mode, SW reset */
#define LTR501_PS_CONTR 0x81 /* PS operation mode */
#define LTR501_PS_MEAS_RATE 0x84 /* measurement rate*/
#define LTR501_ALS_MEAS_RATE 0x85 /* ALS integ time, measurement rate*/
#define LTR501_PART_ID 0x86
#define LTR501_MANUFAC_ID 0x87
#define LTR501_ALS_DATA1 0x88 /* 16-bit, little endian */
#define LTR501_ALS_DATA0 0x8a /* 16-bit, little endian */
#define LTR501_ALS_PS_STATUS 0x8c
#define LTR501_PS_DATA 0x8d /* 16-bit, little endian */
#define LTR501_INTR 0x8f /* output mode, polarity, mode */
#define LTR501_PS_THRESH_UP 0x90 /* 11 bit, ps upper threshold */
#define LTR501_PS_THRESH_LOW 0x92 /* 11 bit, ps lower threshold */
#define LTR501_ALS_THRESH_UP 0x97 /* 16 bit, ALS upper threshold */
#define LTR501_ALS_THRESH_LOW 0x99 /* 16 bit, ALS lower threshold */
#define LTR501_INTR_PRST 0x9e /* ps thresh, als thresh */
#define LTR501_MAX_REG 0x9f
#define LTR501_ALS_CONTR_SW_RESET BIT(2)
#define LTR501_CONTR_PS_GAIN_MASK (BIT(3) | BIT(2))
#define LTR501_CONTR_PS_GAIN_SHIFT 2
#define LTR501_CONTR_ALS_GAIN_MASK BIT(3)
#define LTR501_CONTR_ACTIVE BIT(1)
#define LTR501_STATUS_ALS_INTR BIT(3)
#define LTR501_STATUS_ALS_RDY BIT(2)
#define LTR501_STATUS_PS_INTR BIT(1)
#define LTR501_STATUS_PS_RDY BIT(0)
#define LTR501_PS_DATA_MASK 0x7ff
#define LTR501_PS_THRESH_MASK 0x7ff
#define LTR501_ALS_THRESH_MASK 0xffff
#define LTR501_ALS_DEF_PERIOD 500000
#define LTR501_PS_DEF_PERIOD 100000
#define LTR501_REGMAP_NAME "ltr501_regmap"
#define LTR501_LUX_CONV(vis_coeff, vis_data, ir_coeff, ir_data) \
((vis_coeff * vis_data) - (ir_coeff * ir_data))
static const int int_time_mapping[] = {100000, 50000, 200000, 400000};
static const struct reg_field reg_field_it =
REG_FIELD(LTR501_ALS_MEAS_RATE, 3, 4);
static const struct reg_field reg_field_als_intr =
REG_FIELD(LTR501_INTR, 1, 1);
static const struct reg_field reg_field_ps_intr =
REG_FIELD(LTR501_INTR, 0, 0);
static const struct reg_field reg_field_als_rate =
REG_FIELD(LTR501_ALS_MEAS_RATE, 0, 2);
static const struct reg_field reg_field_ps_rate =
REG_FIELD(LTR501_PS_MEAS_RATE, 0, 3);
static const struct reg_field reg_field_als_prst =
REG_FIELD(LTR501_INTR_PRST, 0, 3);
static const struct reg_field reg_field_ps_prst =
REG_FIELD(LTR501_INTR_PRST, 4, 7);
struct ltr501_samp_table {
int freq_val; /* repetition frequency in micro HZ*/
int time_val; /* repetition rate in micro seconds */
};
#define LTR501_RESERVED_GAIN -1
enum {
ltr501 = 0,
ltr559,
ltr301,
};
struct ltr501_gain {
int scale;
int uscale;
};
static const struct ltr501_gain ltr501_als_gain_tbl[] = {
{1, 0},
{0, 5000},
};
static const struct ltr501_gain ltr559_als_gain_tbl[] = {
{1, 0},
{0, 500000},
{0, 250000},
{0, 125000},
{LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN},
{LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN},
{0, 20000},
{0, 10000},
};
static const struct ltr501_gain ltr501_ps_gain_tbl[] = {
{1, 0},
{0, 250000},
{0, 125000},
{0, 62500},
};
static const struct ltr501_gain ltr559_ps_gain_tbl[] = {
{0, 62500}, /* x16 gain */
{0, 31250}, /* x32 gain */
{0, 15625}, /* bits X1 are for x64 gain */
{0, 15624},
};
struct ltr501_chip_info {
u8 partid;
const struct ltr501_gain *als_gain;
int als_gain_tbl_size;
const struct ltr501_gain *ps_gain;
int ps_gain_tbl_size;
u8 als_mode_active;
u8 als_gain_mask;
u8 als_gain_shift;
struct iio_chan_spec const *channels;
const int no_channels;
const struct iio_info *info;
const struct iio_info *info_no_irq;
};
struct ltr501_data {
struct i2c_client *client;
struct mutex lock_als, lock_ps;
struct ltr501_chip_info *chip_info;
u8 als_contr, ps_contr;
int als_period, ps_period; /* period in micro seconds */
struct regmap *regmap;
struct regmap_field *reg_it;
struct regmap_field *reg_als_intr;
struct regmap_field *reg_ps_intr;
struct regmap_field *reg_als_rate;
struct regmap_field *reg_ps_rate;
struct regmap_field *reg_als_prst;
struct regmap_field *reg_ps_prst;
};
static const struct ltr501_samp_table ltr501_als_samp_table[] = {
{20000000, 50000}, {10000000, 100000},
{5000000, 200000}, {2000000, 500000},
{1000000, 1000000}, {500000, 2000000},
{500000, 2000000}, {500000, 2000000}
};
static const struct ltr501_samp_table ltr501_ps_samp_table[] = {
{20000000, 50000}, {14285714, 70000},
{10000000, 100000}, {5000000, 200000},
{2000000, 500000}, {1000000, 1000000},
{500000, 2000000}, {500000, 2000000},
{500000, 2000000}
};
static int ltr501_match_samp_freq(const struct ltr501_samp_table *tab,
int len, int val, int val2)
{
int i, freq;
freq = val * 1000000 + val2;
for (i = 0; i < len; i++) {
if (tab[i].freq_val == freq)
return i;
}
return -EINVAL;
}
static int ltr501_als_read_samp_freq(const struct ltr501_data *data,
int *val, int *val2)
{
int ret, i;
ret = regmap_field_read(data->reg_als_rate, &i);
if (ret < 0)
return ret;
if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table))
return -EINVAL;
*val = ltr501_als_samp_table[i].freq_val / 1000000;
*val2 = ltr501_als_samp_table[i].freq_val % 1000000;
return IIO_VAL_INT_PLUS_MICRO;
}
static int ltr501_ps_read_samp_freq(const struct ltr501_data *data,
int *val, int *val2)
{
int ret, i;
ret = regmap_field_read(data->reg_ps_rate, &i);
if (ret < 0)
return ret;
if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table))
return -EINVAL;
*val = ltr501_ps_samp_table[i].freq_val / 1000000;
*val2 = ltr501_ps_samp_table[i].freq_val % 1000000;
return IIO_VAL_INT_PLUS_MICRO;
}
static int ltr501_als_write_samp_freq(struct ltr501_data *data,
int val, int val2)
{
int i, ret;
i = ltr501_match_samp_freq(ltr501_als_samp_table,
ARRAY_SIZE(ltr501_als_samp_table),
val, val2);
if (i < 0)
return i;
mutex_lock(&data->lock_als);
ret = regmap_field_write(data->reg_als_rate, i);
mutex_unlock(&data->lock_als);
return ret;
}
static int ltr501_ps_write_samp_freq(struct ltr501_data *data,
int val, int val2)
{
int i, ret;
i = ltr501_match_samp_freq(ltr501_ps_samp_table,
ARRAY_SIZE(ltr501_ps_samp_table),
val, val2);
if (i < 0)
return i;
mutex_lock(&data->lock_ps);
ret = regmap_field_write(data->reg_ps_rate, i);
mutex_unlock(&data->lock_ps);
return ret;
}
static int ltr501_als_read_samp_period(const struct ltr501_data *data, int *val)
{
int ret, i;
ret = regmap_field_read(data->reg_als_rate, &i);
if (ret < 0)
return ret;
if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table))
return -EINVAL;
*val = ltr501_als_samp_table[i].time_val;
return IIO_VAL_INT;
}
static int ltr501_ps_read_samp_period(const struct ltr501_data *data, int *val)
{
int ret, i;
ret = regmap_field_read(data->reg_ps_rate, &i);
if (ret < 0)
return ret;
if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table))
return -EINVAL;
*val = ltr501_ps_samp_table[i].time_val;
return IIO_VAL_INT;
}
/* IR and visible spectrum coeff's are given in data sheet */
static unsigned long ltr501_calculate_lux(u16 vis_data, u16 ir_data)
{
unsigned long ratio, lux;
if (vis_data == 0)
return 0;
/* multiply numerator by 100 to avoid handling ratio < 1 */
ratio = DIV_ROUND_UP(ir_data * 100, ir_data + vis_data);
if (ratio < 45)
lux = LTR501_LUX_CONV(1774, vis_data, -1105, ir_data);
else if (ratio >= 45 && ratio < 64)
lux = LTR501_LUX_CONV(3772, vis_data, 1336, ir_data);
else if (ratio >= 64 && ratio < 85)
lux = LTR501_LUX_CONV(1690, vis_data, 169, ir_data);
else
lux = 0;
return lux / 1000;
}
static int ltr501_drdy(const struct ltr501_data *data, u8 drdy_mask)
{
int tries = 100;
int ret, status;
while (tries--) {
ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status);
if (ret < 0)
return ret;
if ((status & drdy_mask) == drdy_mask)
return 0;
msleep(25);
}
dev_err(&data->client->dev, "ltr501_drdy() failed, data not ready\n");
return -EIO;
}
static int ltr501_set_it_time(struct ltr501_data *data, int it)
{
int ret, i, index = -1, status;
for (i = 0; i < ARRAY_SIZE(int_time_mapping); i++) {
if (int_time_mapping[i] == it) {
index = i;
break;
}
}
/* Make sure integ time index is valid */
if (index < 0)
return -EINVAL;
ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status);
if (ret < 0)
return ret;
if (status & LTR501_CONTR_ALS_GAIN_MASK) {
/*
* 200 ms and 400 ms integ time can only be
* used in dynamic range 1
*/
if (index > 1)
return -EINVAL;
} else
/* 50 ms integ time can only be used in dynamic range 2 */
if (index == 1)
return -EINVAL;
return regmap_field_write(data->reg_it, index);
}
/* read int time in micro seconds */
static int ltr501_read_it_time(const struct ltr501_data *data,
int *val, int *val2)
{
int ret, index;
ret = regmap_field_read(data->reg_it, &index);
if (ret < 0)
return ret;
/* Make sure integ time index is valid */
if (index < 0 || index >= ARRAY_SIZE(int_time_mapping))
return -EINVAL;
*val2 = int_time_mapping[index];
*val = 0;
return IIO_VAL_INT_PLUS_MICRO;
}
static int ltr501_read_als(const struct ltr501_data *data, __le16 buf[2])
{
int ret;
ret = ltr501_drdy(data, LTR501_STATUS_ALS_RDY);
if (ret < 0)
return ret;
/* always read both ALS channels in given order */
return regmap_bulk_read(data->regmap, LTR501_ALS_DATA1,
buf, 2 * sizeof(__le16));
}
static int ltr501_read_ps(const struct ltr501_data *data)
{
int ret, status;
ret = ltr501_drdy(data, LTR501_STATUS_PS_RDY);
if (ret < 0)
return ret;
ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
&status, 2);
if (ret < 0)
return ret;
return status;
}
static int ltr501_read_intr_prst(const struct ltr501_data *data,
enum iio_chan_type type,
int *val2)
{
int ret, samp_period, prst;
switch (type) {
case IIO_INTENSITY:
ret = regmap_field_read(data->reg_als_prst, &prst);
if (ret < 0)
return ret;
ret = ltr501_als_read_samp_period(data, &samp_period);
if (ret < 0)
return ret;
*val2 = samp_period * prst;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_PROXIMITY:
ret = regmap_field_read(data->reg_ps_prst, &prst);
if (ret < 0)
return ret;
ret = ltr501_ps_read_samp_period(data, &samp_period);
if (ret < 0)
return ret;
*val2 = samp_period * prst;
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
return -EINVAL;
}
static int ltr501_write_intr_prst(struct ltr501_data *data,
enum iio_chan_type type,
int val, int val2)
{
int ret, samp_period, new_val;
unsigned long period;
if (val < 0 || val2 < 0)
return -EINVAL;
/* period in microseconds */
period = ((val * 1000000) + val2);
switch (type) {
case IIO_INTENSITY:
ret = ltr501_als_read_samp_period(data, &samp_period);
if (ret < 0)
return ret;
/* period should be atleast equal to sampling period */
if (period < samp_period)
return -EINVAL;
new_val = DIV_ROUND_UP(period, samp_period);
if (new_val < 0 || new_val > 0x0f)
return -EINVAL;
mutex_lock(&data->lock_als);
ret = regmap_field_write(data->reg_als_prst, new_val);
mutex_unlock(&data->lock_als);
if (ret >= 0)
data->als_period = period;
return ret;
case IIO_PROXIMITY:
ret = ltr501_ps_read_samp_period(data, &samp_period);
if (ret < 0)
return ret;
/* period should be atleast equal to rate */
if (period < samp_period)
return -EINVAL;
new_val = DIV_ROUND_UP(period, samp_period);
if (new_val < 0 || new_val > 0x0f)
return -EINVAL;
mutex_lock(&data->lock_ps);
ret = regmap_field_write(data->reg_ps_prst, new_val);
mutex_unlock(&data->lock_ps);
if (ret >= 0)
data->ps_period = period;
return ret;
default:
return -EINVAL;
}
return -EINVAL;
}
static const struct iio_event_spec ltr501_als_event_spec[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_RISING,
.mask_separate = BIT(IIO_EV_INFO_VALUE),
}, {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_FALLING,
.mask_separate = BIT(IIO_EV_INFO_VALUE),
}, {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
BIT(IIO_EV_INFO_PERIOD),
},
};
static const struct iio_event_spec ltr501_pxs_event_spec[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_RISING,
.mask_separate = BIT(IIO_EV_INFO_VALUE),
}, {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_FALLING,
.mask_separate = BIT(IIO_EV_INFO_VALUE),
}, {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
BIT(IIO_EV_INFO_PERIOD),
},
};
#define LTR501_INTENSITY_CHANNEL(_idx, _addr, _mod, _shared, \
_evspec, _evsize) { \
.type = IIO_INTENSITY, \
.modified = 1, \
.address = (_addr), \
.channel2 = (_mod), \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = (_shared), \
.scan_index = (_idx), \
.scan_type = { \
.sign = 'u', \
.realbits = 16, \
.storagebits = 16, \
.endianness = IIO_CPU, \
}, \
.event_spec = _evspec,\
.num_event_specs = _evsize,\
}
#define LTR501_LIGHT_CHANNEL() { \
.type = IIO_LIGHT, \
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
.scan_index = -1, \
}
static const struct iio_chan_spec ltr501_channels[] = {
LTR501_LIGHT_CHANNEL(),
LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0,
ltr501_als_event_spec,
ARRAY_SIZE(ltr501_als_event_spec)),
LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR,
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_SAMP_FREQ),
NULL, 0),
{
.type = IIO_PROXIMITY,
.address = LTR501_PS_DATA,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE),
.scan_index = 2,
.scan_type = {
.sign = 'u',
.realbits = 11,
.storagebits = 16,
.endianness = IIO_CPU,
},
.event_spec = ltr501_pxs_event_spec,
.num_event_specs = ARRAY_SIZE(ltr501_pxs_event_spec),
},
IIO_CHAN_SOFT_TIMESTAMP(3),
};
static const struct iio_chan_spec ltr301_channels[] = {
LTR501_LIGHT_CHANNEL(),
LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0,
ltr501_als_event_spec,
ARRAY_SIZE(ltr501_als_event_spec)),
LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR,
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_SAMP_FREQ),
NULL, 0),
IIO_CHAN_SOFT_TIMESTAMP(2),
};
static int ltr501_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct ltr501_data *data = iio_priv(indio_dev);
__le16 buf[2];
int ret, i;
switch (mask) {
case IIO_CHAN_INFO_PROCESSED:
switch (chan->type) {
case IIO_LIGHT:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
mutex_lock(&data->lock_als);
ret = ltr501_read_als(data, buf);
mutex_unlock(&data->lock_als);
iio_device_release_direct_mode(indio_dev);
if (ret < 0)
return ret;
*val = ltr501_calculate_lux(le16_to_cpu(buf[1]),
le16_to_cpu(buf[0]));
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_RAW:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
switch (chan->type) {
case IIO_INTENSITY:
mutex_lock(&data->lock_als);
ret = ltr501_read_als(data, buf);
mutex_unlock(&data->lock_als);
if (ret < 0)
break;
*val = le16_to_cpu(chan->address == LTR501_ALS_DATA1 ?
buf[0] : buf[1]);
ret = IIO_VAL_INT;
break;
case IIO_PROXIMITY:
mutex_lock(&data->lock_ps);
ret = ltr501_read_ps(data);
mutex_unlock(&data->lock_ps);
if (ret < 0)
break;
*val = ret & LTR501_PS_DATA_MASK;
ret = IIO_VAL_INT;
break;
default:
ret = -EINVAL;
break;
}
iio_device_release_direct_mode(indio_dev);
return ret;
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_INTENSITY:
i = (data->als_contr & data->chip_info->als_gain_mask)
>> data->chip_info->als_gain_shift;
*val = data->chip_info->als_gain[i].scale;
*val2 = data->chip_info->als_gain[i].uscale;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_PROXIMITY:
i = (data->ps_contr & LTR501_CONTR_PS_GAIN_MASK) >>
LTR501_CONTR_PS_GAIN_SHIFT;
*val = data->chip_info->ps_gain[i].scale;
*val2 = data->chip_info->ps_gain[i].uscale;
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_INT_TIME:
switch (chan->type) {
case IIO_INTENSITY:
return ltr501_read_it_time(data, val, val2);
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SAMP_FREQ:
switch (chan->type) {
case IIO_INTENSITY:
return ltr501_als_read_samp_freq(data, val, val2);
case IIO_PROXIMITY:
return ltr501_ps_read_samp_freq(data, val, val2);
default:
return -EINVAL;
}
}
return -EINVAL;
}
static int ltr501_get_gain_index(const struct ltr501_gain *gain, int size,
int val, int val2)
{
int i;
for (i = 0; i < size; i++)
if (val == gain[i].scale && val2 == gain[i].uscale)
return i;
return -1;
}
static int ltr501_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct ltr501_data *data = iio_priv(indio_dev);
int i, ret, freq_val, freq_val2;
struct ltr501_chip_info *info = data->chip_info;
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
switch (mask) {
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_INTENSITY:
i = ltr501_get_gain_index(info->als_gain,
info->als_gain_tbl_size,
val, val2);
if (i < 0) {
ret = -EINVAL;
break;
}
data->als_contr &= ~info->als_gain_mask;
data->als_contr |= i << info->als_gain_shift;
ret = regmap_write(data->regmap, LTR501_ALS_CONTR,
data->als_contr);
break;
case IIO_PROXIMITY:
i = ltr501_get_gain_index(info->ps_gain,
info->ps_gain_tbl_size,
val, val2);
if (i < 0) {
ret = -EINVAL;
break;
}
data->ps_contr &= ~LTR501_CONTR_PS_GAIN_MASK;
data->ps_contr |= i << LTR501_CONTR_PS_GAIN_SHIFT;
ret = regmap_write(data->regmap, LTR501_PS_CONTR,
data->ps_contr);
break;
default:
ret = -EINVAL;
break;
}
break;
case IIO_CHAN_INFO_INT_TIME:
switch (chan->type) {
case IIO_INTENSITY:
if (val != 0) {
ret = -EINVAL;
break;
}
mutex_lock(&data->lock_als);
ret = ltr501_set_it_time(data, val2);
mutex_unlock(&data->lock_als);
break;
default:
ret = -EINVAL;
break;
}
break;
case IIO_CHAN_INFO_SAMP_FREQ:
switch (chan->type) {
case IIO_INTENSITY:
ret = ltr501_als_read_samp_freq(data, &freq_val,
&freq_val2);
if (ret < 0)
break;
ret = ltr501_als_write_samp_freq(data, val, val2);
if (ret < 0)
break;
/* update persistence count when changing frequency */
ret = ltr501_write_intr_prst(data, chan->type,
0, data->als_period);
if (ret < 0)
ret = ltr501_als_write_samp_freq(data, freq_val,
freq_val2);
break;
case IIO_PROXIMITY:
ret = ltr501_ps_read_samp_freq(data, &freq_val,
&freq_val2);
if (ret < 0)
break;
ret = ltr501_ps_write_samp_freq(data, val, val2);
if (ret < 0)
break;
/* update persistence count when changing frequency */
ret = ltr501_write_intr_prst(data, chan->type,
0, data->ps_period);
if (ret < 0)
ret = ltr501_ps_write_samp_freq(data, freq_val,
freq_val2);
break;
default:
ret = -EINVAL;
break;
}
break;
default:
ret = -EINVAL;
break;
}
iio_device_release_direct_mode(indio_dev);
return ret;
}
static int ltr501_read_thresh(const struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int *val, int *val2)
{
const struct ltr501_data *data = iio_priv(indio_dev);
int ret, thresh_data;
switch (chan->type) {
case IIO_INTENSITY:
switch (dir) {
case IIO_EV_DIR_RISING:
ret = regmap_bulk_read(data->regmap,
LTR501_ALS_THRESH_UP,
&thresh_data, 2);
if (ret < 0)
return ret;
*val = thresh_data & LTR501_ALS_THRESH_MASK;
return IIO_VAL_INT;
case IIO_EV_DIR_FALLING:
ret = regmap_bulk_read(data->regmap,
LTR501_ALS_THRESH_LOW,
&thresh_data, 2);
if (ret < 0)
return ret;
*val = thresh_data & LTR501_ALS_THRESH_MASK;
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_PROXIMITY:
switch (dir) {
case IIO_EV_DIR_RISING:
ret = regmap_bulk_read(data->regmap,
LTR501_PS_THRESH_UP,
&thresh_data, 2);
if (ret < 0)
return ret;
*val = thresh_data & LTR501_PS_THRESH_MASK;
return IIO_VAL_INT;
case IIO_EV_DIR_FALLING:
ret = regmap_bulk_read(data->regmap,
LTR501_PS_THRESH_LOW,
&thresh_data, 2);
if (ret < 0)
return ret;
*val = thresh_data & LTR501_PS_THRESH_MASK;
return IIO_VAL_INT;
default:
return -EINVAL;
}
default:
return -EINVAL;
}
return -EINVAL;
}
static int ltr501_write_thresh(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int val, int val2)
{
struct ltr501_data *data = iio_priv(indio_dev);
int ret;
if (val < 0)
return -EINVAL;
switch (chan->type) {
case IIO_INTENSITY:
if (val > LTR501_ALS_THRESH_MASK)
return -EINVAL;
switch (dir) {
case IIO_EV_DIR_RISING:
mutex_lock(&data->lock_als);
ret = regmap_bulk_write(data->regmap,
LTR501_ALS_THRESH_UP,
&val, 2);
mutex_unlock(&data->lock_als);
return ret;
case IIO_EV_DIR_FALLING:
mutex_lock(&data->lock_als);
ret = regmap_bulk_write(data->regmap,
LTR501_ALS_THRESH_LOW,
&val, 2);
mutex_unlock(&data->lock_als);
return ret;
default:
return -EINVAL;
}
case IIO_PROXIMITY:
if (val > LTR501_PS_THRESH_MASK)
return -EINVAL;
switch (dir) {
case IIO_EV_DIR_RISING:
mutex_lock(&data->lock_ps);
ret = regmap_bulk_write(data->regmap,
LTR501_PS_THRESH_UP,
&val, 2);
mutex_unlock(&data->lock_ps);
return ret;
case IIO_EV_DIR_FALLING:
mutex_lock(&data->lock_ps);
ret = regmap_bulk_write(data->regmap,
LTR501_PS_THRESH_LOW,
&val, 2);
mutex_unlock(&data->lock_ps);
return ret;
default:
return -EINVAL;
}
default:
return -EINVAL;
}
return -EINVAL;
}
static int ltr501_read_event(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int *val, int *val2)
{
int ret;
switch (info) {
case IIO_EV_INFO_VALUE:
return ltr501_read_thresh(indio_dev, chan, type, dir,
info, val, val2);
case IIO_EV_INFO_PERIOD:
ret = ltr501_read_intr_prst(iio_priv(indio_dev),
chan->type, val2);
*val = *val2 / 1000000;
*val2 = *val2 % 1000000;
return ret;
default:
return -EINVAL;
}
return -EINVAL;
}
static int ltr501_write_event(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int val, int val2)
{
switch (info) {
case IIO_EV_INFO_VALUE:
if (val2 != 0)
return -EINVAL;
return ltr501_write_thresh(indio_dev, chan, type, dir,
info, val, val2);
case IIO_EV_INFO_PERIOD:
return ltr501_write_intr_prst(iio_priv(indio_dev), chan->type,
val, val2);
default:
return -EINVAL;
}
return -EINVAL;
}
static int ltr501_read_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir)
{
struct ltr501_data *data = iio_priv(indio_dev);
int ret, status;
switch (chan->type) {
case IIO_INTENSITY:
ret = regmap_field_read(data->reg_als_intr, &status);
if (ret < 0)
return ret;
return status;
case IIO_PROXIMITY:
ret = regmap_field_read(data->reg_ps_intr, &status);
if (ret < 0)
return ret;
return status;
default:
return -EINVAL;
}
return -EINVAL;
}
static int ltr501_write_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir, int state)
{
struct ltr501_data *data = iio_priv(indio_dev);
int ret;
/* only 1 and 0 are valid inputs */
if (state != 1 && state != 0)
return -EINVAL;
switch (chan->type) {
case IIO_INTENSITY:
mutex_lock(&data->lock_als);
ret = regmap_field_write(data->reg_als_intr, state);
mutex_unlock(&data->lock_als);
return ret;
case IIO_PROXIMITY:
mutex_lock(&data->lock_ps);
ret = regmap_field_write(data->reg_ps_intr, state);
mutex_unlock(&data->lock_ps);
return ret;
default:
return -EINVAL;
}
return -EINVAL;
}
static ssize_t ltr501_show_proximity_scale_avail(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev));
struct ltr501_chip_info *info = data->chip_info;
ssize_t len = 0;
int i;
for (i = 0; i < info->ps_gain_tbl_size; i++) {
if (info->ps_gain[i].scale == LTR501_RESERVED_GAIN)
continue;
len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
info->ps_gain[i].scale,
info->ps_gain[i].uscale);
}
buf[len - 1] = '\n';
return len;
}
static ssize_t ltr501_show_intensity_scale_avail(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev));
struct ltr501_chip_info *info = data->chip_info;
ssize_t len = 0;
int i;
for (i = 0; i < info->als_gain_tbl_size; i++) {
if (info->als_gain[i].scale == LTR501_RESERVED_GAIN)
continue;
len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
info->als_gain[i].scale,
info->als_gain[i].uscale);
}
buf[len - 1] = '\n';
return len;
}
static IIO_CONST_ATTR_INT_TIME_AVAIL("0.05 0.1 0.2 0.4");
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("20 10 5 2 1 0.5");
static IIO_DEVICE_ATTR(in_proximity_scale_available, S_IRUGO,
ltr501_show_proximity_scale_avail, NULL, 0);
static IIO_DEVICE_ATTR(in_intensity_scale_available, S_IRUGO,
ltr501_show_intensity_scale_avail, NULL, 0);
static struct attribute *ltr501_attributes[] = {
&iio_dev_attr_in_proximity_scale_available.dev_attr.attr,
&iio_dev_attr_in_intensity_scale_available.dev_attr.attr,
&iio_const_attr_integration_time_available.dev_attr.attr,
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
NULL
};
static struct attribute *ltr301_attributes[] = {
&iio_dev_attr_in_intensity_scale_available.dev_attr.attr,
&iio_const_attr_integration_time_available.dev_attr.attr,
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
NULL
};
static const struct attribute_group ltr501_attribute_group = {
.attrs = ltr501_attributes,
};
static const struct attribute_group ltr301_attribute_group = {
.attrs = ltr301_attributes,
};
static const struct iio_info ltr501_info_no_irq = {
.read_raw = ltr501_read_raw,
.write_raw = ltr501_write_raw,
.attrs = &ltr501_attribute_group,
};
static const struct iio_info ltr501_info = {
.read_raw = ltr501_read_raw,
.write_raw = ltr501_write_raw,
.attrs = &ltr501_attribute_group,
.read_event_value = &ltr501_read_event,
.write_event_value = &ltr501_write_event,
.read_event_config = &ltr501_read_event_config,
.write_event_config = &ltr501_write_event_config,
};
static const struct iio_info ltr301_info_no_irq = {
.read_raw = ltr501_read_raw,
.write_raw = ltr501_write_raw,
.attrs = &ltr301_attribute_group,
};
static const struct iio_info ltr301_info = {
.read_raw = ltr501_read_raw,
.write_raw = ltr501_write_raw,
.attrs = &ltr301_attribute_group,
.read_event_value = &ltr501_read_event,
.write_event_value = &ltr501_write_event,
.read_event_config = &ltr501_read_event_config,
.write_event_config = &ltr501_write_event_config,
};
static struct ltr501_chip_info ltr501_chip_info_tbl[] = {
[ltr501] = {
.partid = 0x08,
.als_gain = ltr501_als_gain_tbl,
.als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl),
.ps_gain = ltr501_ps_gain_tbl,
.ps_gain_tbl_size = ARRAY_SIZE(ltr501_ps_gain_tbl),
.als_mode_active = BIT(0) | BIT(1),
.als_gain_mask = BIT(3),
.als_gain_shift = 3,
.info = &ltr501_info,
.info_no_irq = &ltr501_info_no_irq,
.channels = ltr501_channels,
.no_channels = ARRAY_SIZE(ltr501_channels),
},
[ltr559] = {
.partid = 0x09,
.als_gain = ltr559_als_gain_tbl,
.als_gain_tbl_size = ARRAY_SIZE(ltr559_als_gain_tbl),
.ps_gain = ltr559_ps_gain_tbl,
.ps_gain_tbl_size = ARRAY_SIZE(ltr559_ps_gain_tbl),
.als_mode_active = BIT(1),
.als_gain_mask = BIT(2) | BIT(3) | BIT(4),
.als_gain_shift = 2,
.info = &ltr501_info,
.info_no_irq = &ltr501_info_no_irq,
.channels = ltr501_channels,
.no_channels = ARRAY_SIZE(ltr501_channels),
},
[ltr301] = {
.partid = 0x08,
.als_gain = ltr501_als_gain_tbl,
.als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl),
.als_mode_active = BIT(0) | BIT(1),
.als_gain_mask = BIT(3),
.als_gain_shift = 3,
.info = &ltr301_info,
.info_no_irq = &ltr301_info_no_irq,
.channels = ltr301_channels,
.no_channels = ARRAY_SIZE(ltr301_channels),
},
};
static int ltr501_write_contr(struct ltr501_data *data, u8 als_val, u8 ps_val)
{
int ret;
ret = regmap_write(data->regmap, LTR501_ALS_CONTR, als_val);
if (ret < 0)
return ret;
return regmap_write(data->regmap, LTR501_PS_CONTR, ps_val);
}
static irqreturn_t ltr501_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct ltr501_data *data = iio_priv(indio_dev);
struct {
u16 channels[3];
s64 ts __aligned(8);
} scan;
__le16 als_buf[2];
u8 mask = 0;
int j = 0;
int ret, psdata;
memset(&scan, 0, sizeof(scan));
/* figure out which data needs to be ready */
if (test_bit(0, indio_dev->active_scan_mask) ||
test_bit(1, indio_dev->active_scan_mask))
mask |= LTR501_STATUS_ALS_RDY;
if (test_bit(2, indio_dev->active_scan_mask))
mask |= LTR501_STATUS_PS_RDY;
ret = ltr501_drdy(data, mask);
if (ret < 0)
goto done;
if (mask & LTR501_STATUS_ALS_RDY) {
ret = regmap_bulk_read(data->regmap, LTR501_ALS_DATA1,
als_buf, sizeof(als_buf));
if (ret < 0)
return ret;
if (test_bit(0, indio_dev->active_scan_mask))
scan.channels[j++] = le16_to_cpu(als_buf[1]);
if (test_bit(1, indio_dev->active_scan_mask))
scan.channels[j++] = le16_to_cpu(als_buf[0]);
}
if (mask & LTR501_STATUS_PS_RDY) {
ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
&psdata, 2);
if (ret < 0)
goto done;
scan.channels[j++] = psdata & LTR501_PS_DATA_MASK;
}
iio_push_to_buffers_with_timestamp(indio_dev, &scan,
iio_get_time_ns(indio_dev));
done:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static irqreturn_t ltr501_interrupt_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct ltr501_data *data = iio_priv(indio_dev);
int ret, status;
ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status);
if (ret < 0) {
dev_err(&data->client->dev,
"irq read int reg failed\n");
return IRQ_HANDLED;
}
if (status & LTR501_STATUS_ALS_INTR)
iio_push_event(indio_dev,
IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_EITHER),
iio_get_time_ns(indio_dev));
if (status & LTR501_STATUS_PS_INTR)
iio_push_event(indio_dev,
IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_EITHER),
iio_get_time_ns(indio_dev));
return IRQ_HANDLED;
}
static int ltr501_init(struct ltr501_data *data)
{
int ret, status;
ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status);
if (ret < 0)
return ret;
data->als_contr = status | data->chip_info->als_mode_active;
ret = regmap_read(data->regmap, LTR501_PS_CONTR, &status);
if (ret < 0)
return ret;
data->ps_contr = status | LTR501_CONTR_ACTIVE;
ret = ltr501_read_intr_prst(data, IIO_INTENSITY, &data->als_period);
if (ret < 0)
return ret;
ret = ltr501_read_intr_prst(data, IIO_PROXIMITY, &data->ps_period);
if (ret < 0)
return ret;
return ltr501_write_contr(data, data->als_contr, data->ps_contr);
}
static bool ltr501_is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case LTR501_ALS_DATA1:
case LTR501_ALS_DATA0:
case LTR501_ALS_PS_STATUS:
case LTR501_PS_DATA:
return true;
default:
return false;
}
}
static const struct regmap_config ltr501_regmap_config = {
.name = LTR501_REGMAP_NAME,
.reg_bits = 8,
.val_bits = 8,
.max_register = LTR501_MAX_REG,
.cache_type = REGCACHE_RBTREE,
.volatile_reg = ltr501_is_volatile_reg,
};
static int ltr501_powerdown(struct ltr501_data *data)
{
return ltr501_write_contr(data, data->als_contr &
~data->chip_info->als_mode_active,
data->ps_contr & ~LTR501_CONTR_ACTIVE);
}
static const char *ltr501_match_acpi_device(struct device *dev, int *chip_idx)
{
const struct acpi_device_id *id;
id = acpi_match_device(dev->driver->acpi_match_table, dev);
if (!id)
return NULL;
*chip_idx = id->driver_data;
return dev_name(dev);
}
static int ltr501_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ltr501_data *data;
struct iio_dev *indio_dev;
struct regmap *regmap;
int ret, partid, chip_idx = 0;
const char *name = NULL;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
regmap = devm_regmap_init_i2c(client, &ltr501_regmap_config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "Regmap initialization failed.\n");
return PTR_ERR(regmap);
}
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
data->regmap = regmap;
mutex_init(&data->lock_als);
mutex_init(&data->lock_ps);
data->reg_it = devm_regmap_field_alloc(&client->dev, regmap,
reg_field_it);
if (IS_ERR(data->reg_it)) {
dev_err(&client->dev, "Integ time reg field init failed.\n");
return PTR_ERR(data->reg_it);
}
data->reg_als_intr = devm_regmap_field_alloc(&client->dev, regmap,
reg_field_als_intr);
if (IS_ERR(data->reg_als_intr)) {
dev_err(&client->dev, "ALS intr mode reg field init failed\n");
return PTR_ERR(data->reg_als_intr);
}
data->reg_ps_intr = devm_regmap_field_alloc(&client->dev, regmap,
reg_field_ps_intr);
if (IS_ERR(data->reg_ps_intr)) {
dev_err(&client->dev, "PS intr mode reg field init failed.\n");
return PTR_ERR(data->reg_ps_intr);
}
data->reg_als_rate = devm_regmap_field_alloc(&client->dev, regmap,
reg_field_als_rate);
if (IS_ERR(data->reg_als_rate)) {
dev_err(&client->dev, "ALS samp rate field init failed.\n");
return PTR_ERR(data->reg_als_rate);
}
data->reg_ps_rate = devm_regmap_field_alloc(&client->dev, regmap,
reg_field_ps_rate);
if (IS_ERR(data->reg_ps_rate)) {
dev_err(&client->dev, "PS samp rate field init failed.\n");
return PTR_ERR(data->reg_ps_rate);
}
data->reg_als_prst = devm_regmap_field_alloc(&client->dev, regmap,
reg_field_als_prst);
if (IS_ERR(data->reg_als_prst)) {
dev_err(&client->dev, "ALS prst reg field init failed\n");
return PTR_ERR(data->reg_als_prst);
}
data->reg_ps_prst = devm_regmap_field_alloc(&client->dev, regmap,
reg_field_ps_prst);
if (IS_ERR(data->reg_ps_prst)) {
dev_err(&client->dev, "PS prst reg field init failed.\n");
return PTR_ERR(data->reg_ps_prst);
}
ret = regmap_read(data->regmap, LTR501_PART_ID, &partid);
if (ret < 0)
return ret;
if (id) {
name = id->name;
chip_idx = id->driver_data;
} else if (ACPI_HANDLE(&client->dev)) {
name = ltr501_match_acpi_device(&client->dev, &chip_idx);
} else {
return -ENODEV;
}
data->chip_info = &ltr501_chip_info_tbl[chip_idx];
if ((partid >> 4) != data->chip_info->partid)
return -ENODEV;
indio_dev->info = data->chip_info->info;
indio_dev->channels = data->chip_info->channels;
indio_dev->num_channels = data->chip_info->no_channels;
indio_dev->name = name;
indio_dev->modes = INDIO_DIRECT_MODE;
ret = ltr501_init(data);
if (ret < 0)
return ret;
if (client->irq > 0) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
NULL, ltr501_interrupt_handler,
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
"ltr501_thresh_event",
indio_dev);
if (ret) {
dev_err(&client->dev, "request irq (%d) failed\n",
client->irq);
return ret;
}
} else {
indio_dev->info = data->chip_info->info_no_irq;
}
ret = iio_triggered_buffer_setup(indio_dev, NULL,
ltr501_trigger_handler, NULL);
if (ret)
goto powerdown_on_error;
ret = iio_device_register(indio_dev);
if (ret)
goto error_unreg_buffer;
return 0;
error_unreg_buffer:
iio_triggered_buffer_cleanup(indio_dev);
powerdown_on_error:
ltr501_powerdown(data);
return ret;
}
static int ltr501_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
ltr501_powerdown(iio_priv(indio_dev));
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int ltr501_suspend(struct device *dev)
{
struct ltr501_data *data = iio_priv(i2c_get_clientdata(
to_i2c_client(dev)));
return ltr501_powerdown(data);
}
static int ltr501_resume(struct device *dev)
{
struct ltr501_data *data = iio_priv(i2c_get_clientdata(
to_i2c_client(dev)));
return ltr501_write_contr(data, data->als_contr,
data->ps_contr);
}
#endif
static SIMPLE_DEV_PM_OPS(ltr501_pm_ops, ltr501_suspend, ltr501_resume);
static const struct acpi_device_id ltr_acpi_match[] = {
{"LTER0501", ltr501},
{"LTER0559", ltr559},
{"LTER0301", ltr301},
{ },
};
MODULE_DEVICE_TABLE(acpi, ltr_acpi_match);
static const struct i2c_device_id ltr501_id[] = {
{ "ltr501", ltr501},
{ "ltr559", ltr559},
{ "ltr301", ltr301},
{ }
};
MODULE_DEVICE_TABLE(i2c, ltr501_id);
static struct i2c_driver ltr501_driver = {
.driver = {
.name = LTR501_DRV_NAME,
.pm = &ltr501_pm_ops,
.acpi_match_table = ACPI_PTR(ltr_acpi_match),
},
.probe = ltr501_probe,
.remove = ltr501_remove,
.id_table = ltr501_id,
};
module_i2c_driver(ltr501_driver);
MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("Lite-On LTR501 ambient light and proximity sensor driver");
MODULE_LICENSE("GPL");
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